If you've got some extra PlayStation Network and Xbox Live Marketplace credit lying around, this could be a big week for you.

Sony is hosting a special PS Vita sale this week, in commemoration of the system's first anniversary on shelves, that will include big markdowns on a variety of hit games, including Hustle Kings, PlayStation All Stars Battle Royale and Super Stardust Delta.  What's more, if you're a member of PlayStation Plus, you can save even more, up to 50 percent off select titles.  The sale begins tomorrow and runs through next week.

Meanwhile, not to be outdone, Microsoft will be hosting its own digital sale, starting tomorrow and running through next week, on various Xbox Live Games On Demand titles.  Users can save up to 75 to 85 percent off in the Xbox Ultimate Game Sale, and though prices weren't yet revealed, the discounts are for old and new games alike, including Call of Duty: Black Ops II and Borderlands II, among others.

Check out Major Nelson's blog page for a full updated list.

Happy shopping!